Doppler Effect
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WAVES

173004 A warship is fitted with SONAR operating at a frequency of $42 \mathrm{kHz}$. A submarine is approaching towards the ship with a speed of $72 \mathrm{~km} / \mathrm{hr}$. If the speed of sound is $1400 \mathrm{~m} / \mathrm{s}$, what will be the frequency of the received sound after being reflected from the submarine?

1 $40.6 \mathrm{kHz}$
2 $42 \mathrm{kHz}$
3 $43.2 \mathrm{kHz}$
4 $44.3 \mathrm{kHz}$
Assam CEE-2016
WAVES

173005 A bat emitting an ultrasonic wave of frequency $4.5 \times 10^{4} \mathrm{~Hz}$ at speed of $6 \mathrm{~m} / \mathrm{s}$ between two parallel walls. The two frequencies heard by the bat will be

1 $4.67 \times 10^{4} \mathrm{~Hz}, 4.34 \times 10^{4} \mathrm{~Hz}$
2 $4.34 \times 10^{4} \mathrm{~Hz}, 4.67 \times 10^{4} \mathrm{~Hz}$
3 $4.5 \times 10^{4} \mathrm{~Hz}, 5.4 \times 10^{4} \mathrm{~Hz}$
4 $4.67 \times 10^{3} \mathrm{~Hz}, 4.34 \times 10^{4} \mathrm{~Hz}$
JIPMER-2016
WAVES

173006 The apparent frequency observed by a moving observer away from a stationary source is $20 \%$ less than the actual frequency. If the velocity of sound in air is $330 \mathrm{~ms}^{-1}$, then the velocity of the observer is

1 $660 \mathrm{~ms}^{-1}$
2 $330 \mathrm{~ms}^{-1}$
3 $66 \mathrm{~ms}^{-1}$
4 $33 \mathrm{~ms}^{-1}$
5 $20 \mathrm{~ms}^{-1}$
Kerala CEE - 2015
WAVES

173007 The velocity of a moving galaxy is $300 \mathrm{kms}^{-1}$ and the apparent change in wavelength of a spectral line emitted from the galaxy is observed as $0.5 \mathrm{~nm}$. Then, the actual wavelength of the spectral line is

1 $3000 \AA$
2 $5000 \AA$
3 $6000 \AA$
4 $4500 \AA$
5 $5500 \AA$
Kerala CEE - 2010
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WAVES

173004 A warship is fitted with SONAR operating at a frequency of $42 \mathrm{kHz}$. A submarine is approaching towards the ship with a speed of $72 \mathrm{~km} / \mathrm{hr}$. If the speed of sound is $1400 \mathrm{~m} / \mathrm{s}$, what will be the frequency of the received sound after being reflected from the submarine?

1 $40.6 \mathrm{kHz}$
2 $42 \mathrm{kHz}$
3 $43.2 \mathrm{kHz}$
4 $44.3 \mathrm{kHz}$
Assam CEE-2016
WAVES

173005 A bat emitting an ultrasonic wave of frequency $4.5 \times 10^{4} \mathrm{~Hz}$ at speed of $6 \mathrm{~m} / \mathrm{s}$ between two parallel walls. The two frequencies heard by the bat will be

1 $4.67 \times 10^{4} \mathrm{~Hz}, 4.34 \times 10^{4} \mathrm{~Hz}$
2 $4.34 \times 10^{4} \mathrm{~Hz}, 4.67 \times 10^{4} \mathrm{~Hz}$
3 $4.5 \times 10^{4} \mathrm{~Hz}, 5.4 \times 10^{4} \mathrm{~Hz}$
4 $4.67 \times 10^{3} \mathrm{~Hz}, 4.34 \times 10^{4} \mathrm{~Hz}$
JIPMER-2016
WAVES

173006 The apparent frequency observed by a moving observer away from a stationary source is $20 \%$ less than the actual frequency. If the velocity of sound in air is $330 \mathrm{~ms}^{-1}$, then the velocity of the observer is

1 $660 \mathrm{~ms}^{-1}$
2 $330 \mathrm{~ms}^{-1}$
3 $66 \mathrm{~ms}^{-1}$
4 $33 \mathrm{~ms}^{-1}$
5 $20 \mathrm{~ms}^{-1}$
Kerala CEE - 2015
WAVES

173007 The velocity of a moving galaxy is $300 \mathrm{kms}^{-1}$ and the apparent change in wavelength of a spectral line emitted from the galaxy is observed as $0.5 \mathrm{~nm}$. Then, the actual wavelength of the spectral line is

1 $3000 \AA$
2 $5000 \AA$
3 $6000 \AA$
4 $4500 \AA$
5 $5500 \AA$
Kerala CEE - 2010
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WAVES

173004 A warship is fitted with SONAR operating at a frequency of $42 \mathrm{kHz}$. A submarine is approaching towards the ship with a speed of $72 \mathrm{~km} / \mathrm{hr}$. If the speed of sound is $1400 \mathrm{~m} / \mathrm{s}$, what will be the frequency of the received sound after being reflected from the submarine?

1 $40.6 \mathrm{kHz}$
2 $42 \mathrm{kHz}$
3 $43.2 \mathrm{kHz}$
4 $44.3 \mathrm{kHz}$
Assam CEE-2016
WAVES

173005 A bat emitting an ultrasonic wave of frequency $4.5 \times 10^{4} \mathrm{~Hz}$ at speed of $6 \mathrm{~m} / \mathrm{s}$ between two parallel walls. The two frequencies heard by the bat will be

1 $4.67 \times 10^{4} \mathrm{~Hz}, 4.34 \times 10^{4} \mathrm{~Hz}$
2 $4.34 \times 10^{4} \mathrm{~Hz}, 4.67 \times 10^{4} \mathrm{~Hz}$
3 $4.5 \times 10^{4} \mathrm{~Hz}, 5.4 \times 10^{4} \mathrm{~Hz}$
4 $4.67 \times 10^{3} \mathrm{~Hz}, 4.34 \times 10^{4} \mathrm{~Hz}$
JIPMER-2016
WAVES

173006 The apparent frequency observed by a moving observer away from a stationary source is $20 \%$ less than the actual frequency. If the velocity of sound in air is $330 \mathrm{~ms}^{-1}$, then the velocity of the observer is

1 $660 \mathrm{~ms}^{-1}$
2 $330 \mathrm{~ms}^{-1}$
3 $66 \mathrm{~ms}^{-1}$
4 $33 \mathrm{~ms}^{-1}$
5 $20 \mathrm{~ms}^{-1}$
Kerala CEE - 2015
WAVES

173007 The velocity of a moving galaxy is $300 \mathrm{kms}^{-1}$ and the apparent change in wavelength of a spectral line emitted from the galaxy is observed as $0.5 \mathrm{~nm}$. Then, the actual wavelength of the spectral line is

1 $3000 \AA$
2 $5000 \AA$
3 $6000 \AA$
4 $4500 \AA$
5 $5500 \AA$
Kerala CEE - 2010
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WAVES

173004 A warship is fitted with SONAR operating at a frequency of $42 \mathrm{kHz}$. A submarine is approaching towards the ship with a speed of $72 \mathrm{~km} / \mathrm{hr}$. If the speed of sound is $1400 \mathrm{~m} / \mathrm{s}$, what will be the frequency of the received sound after being reflected from the submarine?

1 $40.6 \mathrm{kHz}$
2 $42 \mathrm{kHz}$
3 $43.2 \mathrm{kHz}$
4 $44.3 \mathrm{kHz}$
Assam CEE-2016
WAVES

173005 A bat emitting an ultrasonic wave of frequency $4.5 \times 10^{4} \mathrm{~Hz}$ at speed of $6 \mathrm{~m} / \mathrm{s}$ between two parallel walls. The two frequencies heard by the bat will be

1 $4.67 \times 10^{4} \mathrm{~Hz}, 4.34 \times 10^{4} \mathrm{~Hz}$
2 $4.34 \times 10^{4} \mathrm{~Hz}, 4.67 \times 10^{4} \mathrm{~Hz}$
3 $4.5 \times 10^{4} \mathrm{~Hz}, 5.4 \times 10^{4} \mathrm{~Hz}$
4 $4.67 \times 10^{3} \mathrm{~Hz}, 4.34 \times 10^{4} \mathrm{~Hz}$
JIPMER-2016
WAVES

173006 The apparent frequency observed by a moving observer away from a stationary source is $20 \%$ less than the actual frequency. If the velocity of sound in air is $330 \mathrm{~ms}^{-1}$, then the velocity of the observer is

1 $660 \mathrm{~ms}^{-1}$
2 $330 \mathrm{~ms}^{-1}$
3 $66 \mathrm{~ms}^{-1}$
4 $33 \mathrm{~ms}^{-1}$
5 $20 \mathrm{~ms}^{-1}$
Kerala CEE - 2015
WAVES

173007 The velocity of a moving galaxy is $300 \mathrm{kms}^{-1}$ and the apparent change in wavelength of a spectral line emitted from the galaxy is observed as $0.5 \mathrm{~nm}$. Then, the actual wavelength of the spectral line is

1 $3000 \AA$
2 $5000 \AA$
3 $6000 \AA$
4 $4500 \AA$
5 $5500 \AA$
Kerala CEE - 2010
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